Uneven jawline: one side is bigger.

Sometimes x-rays can be angled a bit and will show an asymmetry that is not significant. I would prefer to see how you look in photos rather than just an x-ray. If you look good from the outside, then I would suggest leaving the mandibular size discrepancy alone. However, if you have external asymmetry that bothers you, you could try fillers as the first option. They are an office procedure with virtually no recovery and it would be a good way to "try on" the effect on your face. A more permanent solution would be an implant, only on the side with the deficit. But remember, we are not treating the x-ray, we are treating you. 

*Opinions stated here are only opinions. They are not based on a clinical exam, which is recommended. 

Without clinical evaluation or a set of photos it would be difficult to give you  good advice. Very frequently bone asymmetry is compensated with soft tissue so that "deformity" may not be visible in real time. Series of full photos or better, clinical evaluation with a board certified plastic surgeon would help. Good luck.

The best approach for an uneven jawline, provided one likes the longer side, is a custom made implant to lower the higher (shorter) side. That is made from a 3D CT scan and is usually placed through an intraoral approach.